CN107560532B - Stroke sensor and saddle-ride type vehicle - Google Patents

Abstract

The stroke sensor (35) includes: a shaft (40) extending in the axial direction; a detected body (71) fixed to the shaft (40); and a housing (50) extending along the shaft (40) The shaft (40) is accommodated, and the shaft (40) is supported so as to be slidable in the axial direction; the detection body (72) is the moving amount of the detected body (71) that moves with the sliding of the shaft (40). For detection, the shaft (40) is provided with a plurality of shaft members (41, 42) that are connected to each other in the axial direction and formed of metal, and the plurality of shaft members (41, 42) are respectively provided with abutment against the housing (50). ) to slide the sliding parts (45, 47) so as to restrict the movement of the shaft (40) in the direction intersecting with the axis (C1).

Description

Trip Sensors and Ride-on Vehicles

technical field

The present invention relates to a travel sensor and a ride-on vehicle.

Background technique

Conventionally, for example, there is a stroke sensor disclosed in Japanese Patent Application Laid-Open No. 2014-130035. The stroke sensor includes a shaft made of iron, a bracket made of resin connected to the shaft, a magnet fixed to the bracket, a case supporting the shaft, and a magnetic detection element that detects the magnetic field of the magnet.

SUMMARY OF THE INVENTION

However, when the bracket is made of resin, it is necessary to integrally mold the bracket, the shaft, and the magnet by injection molding or insert molding, so that high dimensional accuracy may not be obtained. In addition, the accumulation of dimensional errors and the misalignment of the shaft may occur as the number of components increases. In addition, when a stroke sensor is applied to a position where a large temperature change occurs, there is a possibility of thermal deformation of the bracket. Therefore, high detection accuracy may not be maintained.

An object of the aspect of the present invention is to maintain a high detection accuracy in a stroke sensor and a straddle-type vehicle that detect the movement amount of the object to be detected that moves with the sliding of the shaft.

(1) A stroke sensor according to an aspect of the present invention includes: a shaft extending in a direction along the axis; a detected body fixed to the shaft; and a case extending along the shaft and accommodating the above-mentioned a shaft that supports the shaft so as to be slidable in a direction along the axis; a detection body that detects a movement amount of the to-be-detected body that moves along with the sliding of the shaft; the shaft is provided along the axis A plurality of shaft members that are connected to each other in the direction of the axis and formed of metal, and each of the plurality of shaft members is provided with an inner wall that abuts against the housing to restrict movement of the shaft in a direction intersecting the axis way to slide the sliding part.

(2) In the above-described stroke sensor, the shaft may include a subject holding portion that accommodates and holds the subject to be detected, and the plurality of sliding portions may include a holding portion-side sliding portion provided in the subject holding portion. .

(3) In the above stroke sensor, the plurality of sliding portions may further include a non-holding portion-side sliding portion provided at a position avoiding the object holding portion, when viewed from a direction along the axis The outer shape of the sliding portion on the holding portion side is smaller than the outer shape of the sliding portion on the non-holding portion side.

(4) In the above stroke sensor, the shaft may be provided with a groove portion recessed radially inward from the inner wall of the case.

(5) In the above stroke sensor, a lubricant may be arranged in the groove portion.

(6) In the above stroke sensor, a portion of the outer peripheral surface of the sliding portion may have a shape having a flat surface, and the inner wall of the housing may have a shape that fits with the outer peripheral surface of the sliding portion.

(7) In the above stroke sensor, the plurality of sliding parts may include a large sliding part having a relatively large outer shape when viewed in a direction along the axis, and the flat surface may be formed on the large sliding part.

(8) In the above stroke sensor, the case may include a first case half body and a second case half body divided in a direction along the axis, and the plurality of sliding parts may include abutting parts. The first sliding portion of the inner wall of the first housing half body and the second sliding portion abutting to the inner wall of the second housing half body, when viewed from the direction along the axis, the first housing half body The inner wall of the body and the inner wall of the second housing half body have mutually different shapes, and the first sliding portion and the second sliding portion have mutually different shapes when viewed in the direction along the axis.

(9) A straddle-type vehicle according to another aspect of the present invention includes the above-described stroke sensor.

According to the configuration of the above (1), since the shaft is provided with a plurality of shaft members which are connected to each other in the direction along the axis and formed of metal, the dimensional accuracy of the shaft can be improved compared with the case where the shaft member is formed of resin. In addition, since the shaft members formed of metal are connected to each other, it is possible to suppress the accumulation of dimensional errors accompanying the increase of the members, and to suppress the shaft misalignment to be small. In addition, even when a stroke sensor is applied to a position where a large temperature change occurs, the shaft will not be thermally deformed. In addition, each of the plurality of shaft members is provided with a sliding portion that abuts on the inner wall of the housing and slides so as to restrict the movement of the shaft in the direction intersecting with the axis. Thereby, the movement of the shaft in the direction intersecting with the axis can be suppressed when the shaft slides. Therefore, high detection accuracy can be maintained. In addition, when the shaft member is formed of resin, it is necessary to integrally mold the shaft member and the object to be detected by injection molding or insert molding, but according to the configuration of the above (1), injection molding or insert molding is not necessary. The shaft member and the object to be detected are integrally molded. Therefore, the shaft and the subject can be easily assembled.

According to the configuration of the above (2), the shaft includes the object holding portion that accommodates and holds the object to be detected, and the plurality of sliding portions include the holding portion-side sliding portion provided in the object holding portion. As a result, positional deviation between the object to be detected and the object to be detected is less likely to occur, so that high detection accuracy can be more reliably maintained.

According to the configuration of the above (3), the plurality of sliding portions further include the non-holding portion-side sliding portion provided at a position that avoids the subject holding portion, and the outer shape of the holding portion-side sliding portion when viewed in the direction along the axis It is smaller than the outer shape of the sliding part on the non-holding part side. As a result, compared with the case where the outer shape of the holding portion side sliding portion is larger than the outer shape of the non-holding portion side sliding portion when viewed in the direction along the axis, a larger installation space for the detection body can be secured, so that the stroke sensor can be suppressed from being damaged. One side of the sample is increased in size in the radial direction.

According to the configuration of the above (4), the shaft is provided with the groove portion recessed radially inward from the inner wall of the housing. Thereby, since the contact area between the inner wall of the housing and the shaft can be reduced, the sliding resistance can be reduced.

According to the configuration of the above (5), the lubricant is arranged in the groove portion. Thereby, since the lubricant can be retained by the groove portion, the lubricity can be maintained.

According to the configuration of the above (6), a part of the outer peripheral surface of the sliding portion has a shape having a flat surface, and the inner wall of the housing has a shape that fits with the outer peripheral surface of the sliding portion. Thereby, since the movement of the shaft in the circumferential direction with respect to the inner wall of the housing can be restricted, the rotation of the shaft around the axis can be prevented.

According to the configuration of the above (7), the plurality of sliding portions include the large sliding portion having a relatively large outer shape when viewed in the direction along the axis, and the flat surface is formed in the large sliding portion. Thereby, the flat surface can be enlarged. Therefore, the strength of the portion that exhibits the anti-rotation function of the shaft can be ensured, and the rotation of the shaft can be prevented more reliably.

According to the configuration of the above (8), the casing includes the first casing half and the second casing half divided in the direction along the axis, and the plurality of sliding portions include the first casing half that abuts against the first casing half. The first sliding part of the inner wall and the second sliding part abutting against the inner wall of the second casing half body, when viewed from the direction along the axis, the inner wall of the first casing half body and the inner wall of the second casing half body They have mutually different shapes, and the first sliding portion and the second sliding portion have mutually different shapes when viewed in the direction along the axis. Therefore, even if the combination of the first housing half body and the shaft and the combination of the second housing half body and the shaft is wrong, the first housing half body and the shaft cannot be assembled with each other, and the second housing half body and the shaft cannot be assembled with each other. The halves and shafts also cannot be assembled with each other. Therefore, erroneous assembly can be prevented.

According to the configuration of the above (9), it is possible to maintain high detection accuracy in the saddle-ridden vehicle including the above-described stroke sensor.

Description of drawings

FIG. 1 is a left side view of the motorcycle according to the embodiment.

FIG. 2 is a left side view of the stroke sensor of the embodiment.

FIG. 3 is a sectional view taken along line III-III of FIG. 2 .

FIG. 4 is a diagram corresponding to the IV-IV cross section of FIG. 3 .

5 is an exploded perspective view of the stroke sensor according to the embodiment.

6 is a plan view of an axial seal of the cover of the embodiment.

7 is a plan view of a flange surface of the case according to the embodiment.

Fig. 8 is a diagram showing a case in which the flexion and extension portion of the cover according to the embodiment is bent.

FIG. 9 is a view when the flexion and extension portion of the cover according to the embodiment is extended.

FIG. 10 is a view showing a shaft before assembly according to the embodiment.

FIG. 11 is a diagram showing the shaft before assembly following FIG. 10 .

FIG. 12 is a view showing a case before assembly according to the embodiment.

FIG. 13 is a view following FIG. 12 and showing the case before assembly.

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the directions such as front, rear, left, right, etc. in the following description are assumed to be the same as the directions in the vehicle described below unless otherwise specified. In addition, the arrow FR which shows the front of a vehicle, the arrow LH which shows the left side of the vehicle, and the arrow UP which shows the upper direction of a vehicle are shown in the figure used for the following description at appropriate positions.

＜Overall vehicle＞

FIG. 1 shows a motorcycle 1 as an example of a straddle-type vehicle. Referring to FIG. 1 , a motorcycle 1 includes a front wheel 3 steered by a handle 5 and a rear wheel 4 driven by a power unit 10 including an engine. Hereinafter, the motorcycle may be simply referred to as a "vehicle".

Steering system components including the handlebar 5 and the front wheel 3 are pivotally supported by a head pipe 20 formed at the front end portion of the vehicle body frame 2 so as to be steerable. A handlebar steering shaft (not shown) that is connected to the handlebar 5 is inserted into the head pipe 20 . A power unit 10 is arranged in the center portion in the front-rear direction of the vehicle body frame 2 . A swing arm 6 is pivotally supported at the rear of the power unit 10 so as to be able to swing up and down around the pivot shaft 6a. A rear suspension device (not shown) is interposed between the front part of the swing arm 6 and the rear part of the vehicle body frame 2 .

For example, the vehicle body frame 2 is formed of a plurality of steel materials integrally joined by welding or the like. The body frame 2 includes a pair of left and right main frames 21 that extend rearward and downward from the head pipe 20 and then bend downward and extend; a cross member not shown extending in the vehicle width direction so as to connect the left and right main frames 21; A seat rail (not shown) extending rearward and upward from the rear upper end portions of the main frames 21 . An engine hanger 25 extending rearward and downward is provided at each of the front lower ends of the left and right main frames 21 .

The power unit 10 is attached to the rear lower portion of each of the left and right main frames 21 and the engine hanger 25 . The power unit 10 includes a crankcase 11 and a cylinder portion 12 that protrudes forward and upward from an upper portion of the crankcase 11 in a side view.

The fuel tank 8 is arranged above the left and right main frames 21 . A seat 9 is arranged behind the fuel tank 8 and on a seat rail (not shown).

The vehicle body frame 2 is covered with a vehicle body cover 7 . The vehicle body cover 7 includes a front cover 7a that covers the front part of the vehicle body frame 2; a front side cover 7b that covers the side of the front part of the vehicle body frame 2; a lower cover 7c that covers the lower part of the vehicle body frame 2; The rear cover 7d of the rear part of the vehicle body frame 2.

A transmission 30 is integrally provided at the rear of the engine. The transmission 30 includes a shift shaft 31 protruding leftward from the left side of the crankcase 11 ; a shift link mechanism 32 attached to the front end of the shift shaft 31 ; A shift pedal 33 for shifting the shifting member.

The shift link mechanism 32 includes a shift arm 34 attached to the front end of the shift shaft 31 ; a stroke sensor 35 whose upper end is rotatably connected to the shift arm 34 via a connecting pin; A connecting rod 36 at a lower end; an intermediate arm 37 rotatably attached to a support shaft (not shown) provided in the crankcase 11; and a control unit (ECU; Engine Control Unit) not shown. One end portion of the intermediate arm 37 is rotatably coupled to the lower end portion of the link 36 via a coupling pin. The other end portion of the intermediate arm 37 is rotatably coupled to the shift pedal 33 via a coupling pin.

The ECU functions as a control unit that receives a stroke signal (detected value of the stroke amount) from the stroke sensor 35 . Based on the stroke signal, the ECU calculates a load (shift operation load) that occurs when the urging member 63 described later is compressed by the stroke amount.

In addition, in FIG. 1, reference numeral 15 denotes a front fender, reference numeral 16 denotes a rear fender, and reference numeral 17 denotes a main pedal.

<Stroke sensor>

As shown in FIG. 2 , the stroke sensor 35 includes: a shaft 40 extending in a direction along the axis C1; In addition, the shaft 40 is supported so as to be slidable in the direction along the axis C1; the origin return member 60 (see FIG. 3 ) returns the shaft 40 to the origin position; the detection unit 70 (see FIG. 3 ) detects the A sliding amount; and a cover 80 that allows relative movement of the shaft 40 and the housing 50 and covers the sliding end 55a (see FIG. 3 ) on the protruding side of the shaft 40 in the sliding area of the shaft 40 and the housing 50 .

In addition, for convenience, the axis line C1 in the drawing is made to coincide with a straight line extending in the up-down direction. Hereinafter, the direction along the axis C1 may be referred to as the "axial direction", the vertical inner side in the axial direction may be referred to as the "axial direction inner side", and the vertical direction outer side in the axial direction may be referred to as the "axial direction outer side".

<axis>

As shown in FIG. 3 , the shaft 40 includes a plurality of shaft members 41 and 42 which are connected to each other in the axial direction and are formed of metal. The plurality of shaft members 41 and 42 include a first shaft member 41 arranged upward in the axial direction, and a second shaft member 42 arranged downward in the axial direction. The first shaft member 41 is provided with a sliding portion 45 that abuts on the inner wall of the housing 50 and slides so as to restrict the movement of the shaft 40 in the direction intersecting the axis. The second shaft member 42 is provided with a sliding portion 47 that abuts on the inner wall of the housing 50 and slides so as to restrict the movement of the shaft 40 in the direction intersecting the axis.

<First shaft part>

The first shaft member 41 is formed of a non-magnetic metal. For example, the first shaft member 41 is formed of austenitic stainless steel (SUS; Steel Use Stainless).

The first shaft member 41 includes a first shaft member main body 41a extending in the axial direction; a connecting portion 41b protruding downward from the lower end of the first shaft member main body 41a and connected to the second shaft member 42; and provided in the first shaft member main body The upper end of 41a accommodates the subject holding portion 41c that holds the subject 71 and the enlarged diameter portion 46 that is close to the inner wall of the casing 50 with a small gap without abutting (sliding) on the inner wall of the casing 50 .

The first shaft member main body 41a has a cylindrical shape extending linearly in the axial direction. The outer peripheral surface of the first shaft member main body 41a is formed of a smooth surface.

The connection portion 41b extends coaxially with the first shaft member main body 41a. The connection portion 41b has a cylindrical shape with a diameter smaller than that of the first shaft member main body 41a. A male screw portion 41j having screw threads is formed on the outer peripheral surface of the connection portion 41b.

The subject holding portion 41c has a concave shape recessed inward in the axial direction from the upper end of the first shaft member main body 41a. The subject 71 is press-fitted and held in the subject holding portion 41c. The subject 71 is firmly fixed to the subject holding portion 41c by a fixing means such as an adhesive.

As shown in FIG. 4 , the enlarged diameter portion 46 is integrally connected to the outer peripheral surface of the first shaft member main body 41a. The enlarged diameter portion 46 has a D-ring shape having an outer shape larger than that of the first shaft member main body 41a when viewed in the axial direction. A part of the outer peripheral surface of the enlarged diameter part 46 is formed in the shape which has the flat surface 46a. The inner wall of the case 50 has a shape that fits with the outer peripheral surface of the enlarged diameter portion 46 . That is, when viewed from the axial direction, the contour of the inner wall of the housing 50 is formed along the contour of the outer peripheral surface of the enlarged diameter portion 46 .

<Second shaft part>

Returning to FIG. 3 , the second shaft member 42 is formed of a non-magnetic metal. In addition, the second shaft member 42 can be preferably formed of a non-magnetic metal like the first shaft member 41, but may be formed of a soft magnetic material such as steel. Since the distance between the second shaft member 42 and the detection part 70 (magnet, magnetic detection element, etc.) is ensured, even if it is formed of a soft magnetic material such as steel, the degree of influence on the magnetic field is low. An appropriate material for the second shaft member 42 can be selected in consideration of cost and strength.

The second shaft member 42 includes a second shaft member main body 42a extending in the axial direction; a connected portion 42b provided at an upper end portion of the second shaft member main body 42a and connected to the first shaft member 41; The guide part 42c which guides the lower end part of 41a. The second shaft member 42 is provided with a rib 43 that protrudes radially outward so as to be in close contact with the cover 80 .

The second shaft member main body 42a has a cylindrical shape extending linearly coaxially with the first shaft member main body 41a. The second shaft member main body 42a is exposed to the outside so as to protrude downward from the housing 50 .

The connected portion 42b extends coaxially with the second shaft member main body 42a. The connected portion 42b has a cylindrical shape with a diameter larger than that of the second shaft member main body 42a. A female screw portion 42j having screw threads is formed on the inner peripheral surface of the connected portion 42b. The male screw portion 41j of the first shaft member 41 is screwed to the female screw portion 42j of the second shaft member 42 . For example, between the connecting portion 41b and the connected portion 42b, from the viewpoint of preventing loosening of screws, a reinforcing adhesive such as a sealant is filled.

The guide portion 42c has a cylindrical shape connected to the upper end of the connected portion 42b. When viewed from the axial direction, the guide portion 42c has substantially the same outer shape as the connected portion 42b. When viewed in the axial direction, the guide portion 42c has an inner shape larger than that of the connected portion 42b. The inner shape of the guide portion 42c has a size corresponding to the outer shape of the first shaft member main body 41a that can guide the first shaft member main body 41a when viewed in the axial direction. The inner peripheral surface of the guide portion 42c is formed of a smooth surface.

<Sliding part>

The plurality of sliding parts 45 and 47 are provided with a plurality of (for example, two in the present embodiment) holding part side sliding parts 45 provided on the subject holding part 41 c; A plurality of positions (for example, two in the present embodiment) of the non-holding portion side sliding portions 47 . The two non-holding portion side sliding portions 47 are provided on the second shaft member 42 .

The holder-side sliding portion 45 is integrally connected to the outer peripheral surface of the subject holding portion 41c. The holder-side sliding portion 45 has an annular shape having an outer shape larger than that of the subject holding portion 41c when viewed in the axial direction.

The non-holding portion side sliding portion 47 is integrally connected to the outer peripheral surface of the guide portion 42 c of the second shaft member 42 . The non-holding portion-side sliding portion 47 has a D-ring shape having an outer shape larger than that of the guide portion 42c when viewed in the axial direction.

When viewed in the axial direction, the outer shape of the enlarged diameter portion 46 and the outer shape of the non-holding portion side sliding portion 47 are substantially the same size. The outer shape of the holding portion side sliding portion 45 is smaller than the outer shape of the non-holding portion side sliding portion 47 when viewed in the axial direction.

As shown in FIG. 5, a part of the outer peripheral surface of the non-holding part side sliding part 47 has the shape which has the flat surface 47a. That is, the flat surface 47 a is formed on the non-holding portion side sliding portion 47 .

Further, the non-holding portion-side sliding portion 47 has a relatively large outer shape when viewed in the axial direction. The non-holding portion side sliding portion 47 is sometimes referred to as a "large sliding portion".

As shown in FIG. 3 , the shaft 40 is provided with a groove portion 48 recessed radially inward from the inner wall of the housing 50 . The groove portion 48 is provided in the first shaft member 41 between the two holding portion side sliding portions 45 that are adjacent to each other in the axial direction, and the holding portion side sliding portion 45 and the enlarged diameter portion that are adjacent to each other in the axial direction. between 46. The groove portion 48 is provided between the two non-holding portion side sliding portions 47 adjacent to each other in the axial direction in the second shaft member 42 . A lubricant (not shown) is arranged in the groove portion 48 .

＜Case＞

The case 50 includes a first case half body 51 and a second case half body 55 divided in the axial direction.

<First housing half>

The first housing half 51 is formed of a non-magnetic material. For example, the first housing half body 51 is formed of a metal material such as aluminum and stainless steel, or a resin material such as polybutylene terephthalate (PBT; Poly Butylene Terephthalate).

The first housing half body 51 includes a first housing half body main body 52 extending in the axial direction; a detection body housing portion 53 provided on the upper side portion of the first housing half body body 52 and accommodating the detection body 72; And the connected part 54 provided in the lower end part of the 1st case half body main body 52 and connected to the 2nd case half body 55.

The first casing half main body 52 has a cylindrical shape in which the first shaft member 41 is slidably accommodated. The first housing half main body 52 includes a holder-side inner wall 52 a that slidably holds the holder-side sliding portion 45 ; has an inner shape larger than the holder-side inner wall 52 a when viewed in the axial direction, and surrounds the enlarged diameter portion 46 . The first non-retaining portion side inner wall 52b; Between the first non-holding portion side inner wall 52b and the guide inner wall 52c, a first piston restricting surface 52f that restricts movement of the first piston 61 of the origin return member 60 in the axial direction (upward) is provided.

The sample accommodating portion 53 is radially arranged at a portion overlapping with the moving region of the subject 71 in the axial direction. The sample accommodating portion 53 includes a sample accommodating recess 53a for accommodating the sample 72, and a substrate accommodating portion 53b having an inner shape larger than the sample accommodating recess 53a, opening radially outward, and communicating with the sample accommodating recess 53a. A printed wiring board 74 connected to an external device (not shown) via a cable 73 (see FIG. 2 ) is housed in the board housing portion 53b. The printed wiring board 74 is fixed to the first housing half body 51 by a plurality of screws 75 .

A gasket 76 (refer to FIG. 2 ) that protects the cable 73 is provided in the connection portion of the cable 73 to the printed wiring board 74 . Filling members 77 such as sealing material are provided in the detector housing portion 53 and the board housing portion 53b to airtightly seal the detector body 72 , the printed wiring board 74 , and the connection portion between the printed wiring board 74 and the cable 73 .

The connected portion 54 has a cylindrical shape extending coaxially with the first case half main body 52 . On the inner peripheral surface of the connected portion 54, a female screw portion 54j having screw threads is formed.

<Second housing half>

The second housing half 55 is formed of a non-magnetic material. In addition, the second case half body 55 is preferably formed of a non-magnetic metal like the first case half body 51, but may be formed of a soft magnetic material such as steel. The second case half 55 has a low influence on the magnetic field even if it is formed of a soft magnetic material such as steel because the distance from the detection unit 70 (magnet, magnetic detection element, etc.) is secured. An appropriate material for the second housing half body 55 can be selected in consideration of cost and strength.

The second case half body 55 includes a second case half body main body 56 extending in the axial direction; 57. The second housing half 55 is provided with a flange surface 58 extending radially outward from the sliding end 55 a, and a protruding wall 59 protruding outward (ie, downward) in the axial direction from the outer peripheral portion of the flange surface 58 . .

The second housing half main body 56 has a cylindrical shape in which the second shaft member 42 is slidably accommodated. The second case half body 56 includes a second non-holding portion-side inner wall 56a that slidably holds the non-holding portion-side sliding portion 47, and has an interior larger than the second non-holding portion-side inner wall 56a when viewed in the axial direction shape, and the origin return member housing inner wall 56b that accommodates the origin return member 60 . A second piston restricting surface 56f that restricts the movement of the second piston 62 of the origin return member 60 in the axial direction (downward) is provided between the second non-holding portion side inner wall 56a and the origin return member housing inner wall 56b .

The connection portion 57 has a cylindrical shape extending coaxially with the second case half body 56 . A male screw portion 57j having screw threads is formed on the outer peripheral surface of the connection portion 57 . The male thread portion 57j of the second case half body 56 is screwed to the female thread portion 54j of the first case half body 51 . For example, between the connecting portion 57 and the connected portion 54, from the viewpoint of preventing loosening of screws, a reinforcing adhesive such as a sealant is filled.

When viewed from the axial direction, the inner wall 52a on the holding portion side of the first housing half 51 and the inner wall 56a on the second non-holding portion side of the second housing half body 55 have mutually different shapes. When viewed in the axial direction, the holding portion side sliding portion 45 and the non-holding portion side sliding portion 47 have mutually different shapes. The holder-side sliding portion 45 is sometimes referred to as a "first sliding portion". The non-holding portion-side sliding portion 47 is sometimes referred to as a "second sliding portion".

<Origin return member>

The origin return member 60 includes a pair of pistons 61 and 62 arranged in the axial direction, and a biasing member 63 which is provided between the pair of pistons 61 and 62 and biases the pair of pistons 61 and 62 so as to be pulled apart. .

The pair of pistons 61 and 62 are each formed of a non-magnetic material. Further, the pair of pistons 61 and 62 is preferably formed of a non-magnetic metal, but may be formed of a soft magnetic material such as steel. Since the pair of pistons 61 and 62 respectively ensure the distance from the detection part 70 (magnet, magnetic detection element, etc.), even if they are formed of a soft magnetic material such as steel, their influence on the magnetic field is low. For the pair of pistons 61 and 62, an appropriate material can be selected in consideration of aging resistance and strength.

The pair of pistons 61 and 62 includes a first piston 61 arranged on the upper side in the axial direction, and a second piston 62 arranged on the lower side in the axial direction.

The first piston 61 includes a sliding bottom wall 61a which has an annular shape when viewed in the axial direction and is slidably supported by the first shaft member main body 41a, and protrudes downward from the outer peripheral portion of the sliding bottom wall 61a and is surrounded by a surrounding arm. The form of the force member 63 has a cylindrical outer peripheral wall 61b.

The second piston 62 includes a sliding bottom wall 62a having an annular shape when viewed in the axial direction and is slidably supported by the first shaft member main body 41a; The form of the member 63 has a cylindrical outer peripheral wall 62b. That is, the second piston 62 has a shape obtained by inverting the first piston 61 up and down. The slide bottom wall 61a of the first piston 61 has a through hole 61h opened in the axial direction. The slide bottom wall 62a of the second piston 62 has a through hole 62h opened in the axial direction.

The first piston 61 and the second piston 62 are arranged in the housing 50 between the first piston restriction surface 52f and the second piston restriction surface 56f. The first piston 61 is arranged to have a gap between the outer peripheral wall 61 b of the first piston 61 and the origin return member housing inner wall 56 b of the second housing half 55 . The second piston 62 is arranged with a gap between the outer peripheral wall 62 b of the second piston 62 and the origin return member housing inner wall 56 b of the second housing half 55 . As a result, even if a large load is applied after the vehicle is mounted and the shaft 40 is stressed, the first piston 61 and the second piston 62 are less likely to come into contact with the origin return member housing inner wall 56b. The two pistons 62, the origin return member housing inner wall 56b, and the urging member 63 are damaged and other important factors that affect the feeling of operation.

For example, the biasing member 63 is a coil spring formed of a non-magnetic metal such as stainless steel or SUS304WPB. In addition, the urging member 63 may be formed of a soft magnetic material (for example, a hard wire such as SWB, SWC, etc.). The urging member 63 has a low degree of influence on the magnetic field even if it is formed of a soft magnetic material because the distance from the detection portion 70 (magnet, magnetic detection element, etc.) is secured. For the biasing member 63, an appropriate material can be selected in consideration of aging resistance and strength.

The biasing member 63 always biases the first piston 61 and the second piston 62 so as to be separated from each other in the axial direction. That is, regardless of the position of the shaft 40, the biasing member 63 can press the first piston 61 against the first piston restriction surface 52f and the end face 46b of the enlarged diameter portion 46, or press the second piston 62 against the second piston restriction The surface 56f, and the end surface 47b of the non-holding part side sliding part 47. Therefore, even if there is a gap between the outer peripheral wall 61 b of the first piston 61 and the origin return member housing inner wall 56 b of the second housing half 55 , the outer peripheral wall 62 b of the second piston 62 and the second housing half 55 have a gap. There is a gap between the origin return member housing inner walls 56b of the first piston 61 and the vibration of the second piston 62 can also be suppressed, and a certain operation feeling can be obtained for the stroke of the shaft 40 . In addition, by suppressing the vibration of the first piston 61 and the second piston 62, the detection accuracy of the detection body 72 can be stabilized.

When the shaft 40 is at the origin position, the first piston 61 abuts on the first piston restricting surface 52f and the end surface 46b of the enlarged diameter portion 46, and the second piston 62 abuts on the second piston restricting surface 56f and the non-holding portion The end surface 47b of the side sliding portion 47 limits the distance between the shafts. Here, the “distance between axes” means the distance between the lower end of the outer peripheral wall 61 b of the first piston 61 and the upper end of the outer peripheral wall 62 b of the second piston 62 . When the shaft 40 is at the origin position, since the lower end of the outer peripheral wall 61b of the first piston 61 and the upper end of the outer peripheral wall 62b of the second piston 62 are separated from each other in the axial direction, the separation interval d1 becomes the object to be detected 72 The detected stroke of the shaft 40 (detected stroke).

When the shaft 40 located at the origin position is displaced so as to be press-fitted into the housing 50 (that is, press-fit upward), the second piston 61 is in contact with the first piston restricting surface 52f and the second The piston 62 abuts against and supports the end surface 47b of the non-holding portion-side sliding portion 47, and moves upward against the urging force of the urging member 63, whereby the second piston 62 is separated from the second piston restricting surface 56f. The shaft 40 can move upward until the upper end of the outer peripheral wall 62b of the second piston 62 comes into contact with the lower end of the outer peripheral wall 61b of the first piston 61 . Then, when the force for pressing the shaft 40 upward no longer exists, the shaft 40 is returned to the origin position by the urging force of the urging member 63 .

When the shaft 40 located at the origin position is displaced so as to be pulled out from the housing 50 (ie, pulled out downward), in a state where the second piston 62 is in contact with the second piston restricting surface 56f, the first The piston 61 abuts against and supports the end surface 46b of the enlarged diameter portion 46, and moves downward against the urging force of the urging member 63, whereby the first piston 61 is separated from the first piston restricting surface 52f. The shaft 40 can move downward until the lower end of the outer peripheral wall 61 b of the first piston 61 abuts on the upper end of the outer peripheral wall 62 b of the second piston 62 . Then, when the force for pulling the shaft 40 downward no longer exists, the shaft 40 is returned to the origin position by the urging force of the urging member 63 .

In addition, lubricant such as grease is applied to the origin return member housing inner wall 56 b that houses the first piston 61 and the second piston 62 . Thereby, sliding of the first piston 61 and the second piston 62 with respect to the shaft 40 can be ensured stably over a long period of time.

<Detection Section>

The detection unit 70 includes a subject 71 fixed to the shaft 40 , and a subject 72 that detects the amount of movement of the subject 71 that moves along with the sliding of the shaft 40 .

＜Subject to be detected＞

For example, the to-be-detected body 71 is a SmCo sintered magnet which has a cylindrical shape and is magnetized with two poles in the axial direction. The detected body 71 is displaced in the axial direction together with the shaft 40 , thereby changing the orientation (magnetic force) of the magnetic field received by the detection body 72 . Thereby, the movement amount of the to-be-detected body 71 is detected by the detection body 72 .

In addition, the shape of the to-be-detected body 71 is not limited to a cylindrical shape. The subject 71 may have a quadrangular prism shape. In addition, the to-be-detected body 71 may be a rare earth-based magnet such as a samarium cobalt magnet or a neodymium magnet.

In addition, the to-be-detected body 71 is not limited to a sintered magnet. The detected object 71 may also be a plastic magnet. Sintered magnets have stronger magnetic force than plastic magnets. On the other hand, plastic magnets are more excellent in mass productivity and crack resistance than sintered magnets. Therefore, the magnet used for the subject 71 may be appropriately selected according to the usage conditions and design requirements.

＜Sample＞

The detection body 72 includes a plurality of magnetic detection elements. For example, the detector 72 is configured as a magnetic detection package in which a plurality of Hall elements (magnetic detection elements) are mounted on a circuit board. The detection body 72 converts the change of the magnetic force accompanying the displacement of the detection body 71 or the like into an electric signal, and outputs the converted electric signal to the outside.

The magnetic detection surface of the detection body 72 is arranged in a direction perpendicular to the magnetization direction of the detection body 71 .

The detection body 72 is mounted on the surface of the printed wiring board 74 on the side of the detection object 71 . The detection body 72 is air-tight by the above-described filling member 77 in a state of being accommodated in the detection body accommodating portion 53 . Thereby, the gap between the detection body 72 and the to-be-detected body 71 can be reduced as much as possible, and the change of the magnetic field can be detected with high accuracy. In addition, the airtightness may be maintained by a sealing material and a cover member not shown.

The detection body 72 detects the magnetic field of the detection object 71 (the magnetic field in the vertical direction and the magnetic field in the horizontal direction with respect to the magnetic detection surface) using a plurality of Hall elements. The obtained magnetic fields in the two directions are subjected to angle calculation by trigonometric function (ATAN) in a processing circuit (eg, ASIC; Application Specific Integrated Circuit), and the calculation result is output as angle information. Since the output angle information is proportional to the movement amount (stroke) of the shaft 40 , the movement amount of the shaft 40 can be detected as a result.

In addition, the output form of the output from the detection body 72 may be any form as long as it is selected according to an ECU (not shown) or the like that uses the detection result of the detection body 72 . For example, the output method output from the detector 72 includes an analog method, a PWM (Pulse Width Modulation) method, a SENT (Single Edge Nibble Transmission) method, and the like.

＜Cover＞

The cover 80 has a cylindrical shape that closes the gap between the second shaft member 42 of the shaft 40 and the second housing half 55 of the housing 50 . The cover 80 is formed of an elastic member such as rubber.

The cover 80 is provided with an axial seal 81 in close contact with the flange surface 58 in the axial direction; a radial seal 82 in close contact with the second shaft member 42 of the shaft 40 in the radial direction; Between the radial seals 82 and the flexion and extension part 83 which can flex and extend when the shaft 40 slides;

The axial seal 81 is provided with an elastic convex portion 81 a protruding toward the flange surface 58 . As shown in FIG. 6 , the elastic convex portion 81 a has a ring shape so as to surround the sliding end 55 a (see FIG. 3 ) when viewed in the axial direction.

On the other hand, the flange surface 58 is provided with a concave portion 58h into which the elastic convex portion 81a is fitted. As shown in FIG. 7 , the recessed portion 58h has a ring shape so as to surround the sliding end 55a when viewed in the axial direction. That is, when viewed from the axial direction, the recessed portion 58h has an outer shape that overlaps with the elastic convex portion 81a.

In addition, the flange surface 58 has a ring shape when viewed in the axial direction, and has a stepped portion 58 a that is swollen higher than the flange surface 58 by a level near the outer periphery. Thereby, when the cover 80 is assembled, the cover 80 can be temporarily fixed until the cover 80 is fixed by the fixing member 90 .

As shown in FIG. 3 , the radial seal 82 is arranged such that the inner peripheral surface of the radial seal 82 is in close contact with the outer peripheral surface of the second shaft member main body 42a, and the lower end of the radial seal 82 is placed in close contact with the outer peripheral surface of the second shaft member main body 42a. the upper surface of the rib 43 .

The bending-extension portion 83 includes one folded-back portion 83 a disposed at a position close to the casing 50 .

In the cross-sectional view of FIG. 3 , the internal pressure adjustment portion 8 gradually extends from the radially inner end of the axial seal 81 to the lower side and radially inner side, and then passes through the folded portion 83a so as to be further toward the radially inner side. The lower side bends and extends so as to be radially outward, and then bends and extends radially inward to reach the upper end of the radial seal 82 .

The internal pressure adjusting portion 84 expands or contracts so as not to change the volume of the space 85 between the cover 80 and the shaft 40 (hereinafter referred to as “air volume”) when the bending and extending portion 83 is bent and extended with the sliding of the shaft 40 . Thereby adjusting the internal pressure.

For example, when the shaft 40 located at the origin position is displaced so as to be pressed into the housing 50 (that is, to be pressed upward), as shown in FIG. 8 , the cover 80 is pressed in the direction of the arrow V1 , thereby The flexion-extension portion 83 is bent, and the internal pressure adjustment portion 84 expands so as not to change the air volume. In addition, the two-dot chain line in FIG. 8 shows the outline of the cover 80 at the origin position.

On the other hand, when the shaft 40 located at the origin position is displaced so as to be pulled out from the housing 50 (ie, pulled out downward), the cover 80 is pulled in the direction of the arrow V2 as shown in FIG. 9 . Out, the flexion-extension portion 83 is extended, and the internal pressure adjustment portion 84 is contracted so as not to change the air volume. In addition, the two-dot chain line in FIG. 9 shows the outline of the cover 80 at the origin position.

<Fixed parts>

As shown in FIG. 3 , the stroke sensor 35 further includes a fixing member 90 for crimping the axial seal 81 to the flange surface 58 . For example, the fixing member 90 is formed of a metal member. As shown in FIG. 5 , the fixing member 90 has a bowl shape and includes: a peripheral wall 91 having a cylindrical shape that fits into the protruding wall 59; and a bottom wall 92 that is continuous with the peripheral wall 91 and has an axial seal 81 The annular shape that is crimped to the flange surface 58 .

<How to assemble the stroke sensor>

Hereinafter, an example of a method of assembling the stroke sensor 35 will be described.

As shown in FIG. 10 , first, the first shaft member 41 to which the object to be detected 71 is fixed in the axial direction, and the origin return member 60 that sandwiches the biasing member 63 between the first piston 61 and the second piston 62 , and the second shaft member 42 is arranged.

As shown in FIG. 11 , next, the first shaft member 41 is opened from the connecting portion 41 b to the shaft center of the origin return member 60 (ie, the through hole 61 h of the first piston 61 and the through hole 62 h of the second piston 62 ) )insert. At this time, the lower end of the connecting portion 41b of the first shaft member 41 contacts the opening end of the connected portion 42b of the second shaft member 42, whereby the positions of the first shaft member 41 and the second shaft member 42 in the axial direction are aligned. Therefore, the male screw portion 41j of the connecting portion 41b and the female screw portion 42j of the connected portion 42b can be screwed together while the first shaft member 41 and the second shaft member 42 are kept coaxial.

In addition, before the male screw portion 41j of the connecting portion 41b is screwed with the female screw portion 42j of the connected portion 42b, the lower end portion of the first shaft member main body 41a abuts and fits into the opening of the guide portion 42c of the second shaft member 42 The inner peripheral surface on the end side makes the first shaft member 41 and the second shaft member 42 coaxial. Thereby, the origin return member 60 can be sandwiched between the end face 46b of the enlarged diameter portion 46 and the end face 47b of the non-holding portion side sliding portion 47 while the first shaft member 41 and the second shaft member 42 are kept coaxial. The male thread portion 41j of the connecting portion 41b and the female thread portion 42j of the connected portion 42b are screwed together. Therefore, even if there is a repulsive force (elastic force) of the biasing member 63, the first shaft member 41 and the second shaft member 42 are not axially misaligned, and the connecting portion 41b and the connected portion 42b can be easily screwed together.

In addition to this, by providing the non-holding portion side sliding portion 47 on the outer peripheral surface of the guide portion 42c of the second shaft member 42, the first shaft member 41 and the second shaft member 41 can be connected to the first shaft member 41 at the position where the non-holding portion side sliding portion 47 is provided. The biaxial member 42 is pivotally supported. Therefore, even if the shaft 40 has a divided structure, the shaft accuracy of the shaft 40 can be maintained with high accuracy. In addition, by pivotally supporting the first shaft member 41 and the second shaft member 42 at the position where the non-holding portion side sliding portion 47 is provided, the shaft support portions of the first shaft member 41 and the second shaft member 42 are not easily deformed. Therefore, even if the shaft 40 has a divided structure, high-precision detection can be maintained.

As shown in FIG. 12 , next, the shaft 40 to which the origin return member 60 is attached is moved from the lower end of the second shaft member 42 to the opening of the second housing half 55 (ie, the origin return member housing inner wall 56 b ). insert. As described above, the first piston 61 of the return-to-origin member 60 is disposed so as to have a gap between the outer peripheral wall 61b of the first piston 61 and the return-to-origin member housing inner wall 56b of the second housing half 55, and the return-to-origin The second piston 62 of the positioning member 60 is arranged with a gap between the outer peripheral wall 62b of the second piston 62 and the origin return member housing inner wall 56b of the second housing half 55 (see FIG. 3 ). Thereby, the workability|operativity at the time of assembling the shaft 40 to the 2nd housing half body 55 can be improved.

When inserting the shaft 40 into the second housing half 55 (that is, when the second piston 62 is in contact with the second piston restricting surface 56f and the second shaft member 42 protrudes downward from the second housing half 55 ), the After the axial seal 81 of the cover 80 is brought into close contact with the flange surface 58 , the fixing member 90 is pressed and fitted into the protruding wall 59 , and the axial seal 81 is fitted into the lower end of the second housing half 55 .

At this time, the rib 43 of the second shaft member 42 is inserted into the opening of the radial seal 82 of the cover 80 , and the radial seal 82 of the cover 80 is brought into close contact with the outer peripheral surface of the second shaft member 42 and the upper surface of the rib 43 .

Next, as shown in FIG. 13 , the first housing half 51 is coupled to the second housing half 55 attached to the shaft 40 . Specifically, the second half-housing 55 attached to the shaft 40 is inserted into the first half-housing 51 from the upper end of the first shaft member 41 , and the connected portion is connected to the connected portion by the male screw portion 57j of the connecting portion 57 . The female screw portion 54j of 54 is screwed together.

At this time, the holder-side sliding portion 45 provided on the upper end side of the first shaft member 41 abuts and is fitted to the holder-side inner wall 52a of the first housing half 51, so that the fitting position can not be recognized. The male screw portion 57j of the connecting portion 57 and the female screw portion 54j of the connected portion 54 are screwed together in the assembled state.

From the above, the stroke sensor 35 (refer to FIG. 3 ) of the present embodiment is obtained.

In addition, the first housing half 51 is not limited to being connected to the second housing half 55 attached to the shaft 40 , and the second housing half 55 may be connected to the first housing attached to the shaft 40 . Half body 51. That is, even in this case, the holder-side sliding portion 45 provided on the upper end side of the first shaft member 41 abuts and fits into the holder-side inner wall 52 a of the first housing half 51 , so that it is possible to prevent the The male screw portion 57j of the connecting portion 57 and the female screw portion 54j of the connected portion 54 are screwed together in recognition of the assembled state at the fitting position.

As described above, the stroke sensor 35 of the above-described embodiment includes the shaft 40 extending in the axial direction, the detected object 71 fixed to the shaft 40 , and extends along the shaft 40 to accommodate the shaft 40 and supports the shaft 40 so as to be able to The housing 50 that slides in the axial direction and the detection body 72 that detects the movement amount of the subject 71 that moves along with the sliding of the shaft 40 are provided with many shafts 40 connected to each other in the axial direction and formed of metal. Each of the shaft members 41 and 42 is provided with sliding portions 45 and 42 which are respectively provided with sliding portions 45 and 45 that abut against the inner wall of the housing 50 and slide so as to restrict the movement of the shaft 40 in the direction intersecting with the axis C1. 47.

According to this configuration, since the shaft 40 includes the plurality of shaft members 41 and 42 that are connected in the axial direction and formed of metal, the dimensional accuracy of the shaft 40 can be improved compared with the case where the shaft members are formed of resin. In addition, since the shaft members 41 and 42 formed of metal are connected to each other, it is possible to suppress the accumulation of dimensional errors accompanying the increase of the members, and to suppress the misalignment of the shaft 40 to be small. In addition, even when the stroke sensor 35 is applied to a position where a large temperature change occurs, the shaft 40 is not thermally deformed. Further, the plurality of shaft members 41 and 42 are respectively provided with sliding portions 45 and 47 which abut against the inner wall of the housing 50 and slide so as to restrict the movement of the shaft 40 in the direction intersecting with the axis C1 . Thereby, the movement of the shaft 40 in the direction intersecting the axis C1 can be suppressed when the shaft 40 slides. Therefore, high detection accuracy can be maintained. In addition, when the shaft member is formed of resin, it is necessary to integrally mold the shaft member and the object to be detected by injection molding or insert molding, but this configuration eliminates the need for injection molding or insert molding to form the shaft member and the object to be detected. The object to be detected is integrally formed. Therefore, the shaft 40 and the subject 71 can be easily assembled.

Further, in the above-described embodiment, the shaft 40 includes the subject holding portion 41c that accommodates and holds the subject 71, and the plurality of sliding portions 45 and 47 includes the holding portion-side sliding portion 45 provided in the subject holding portion 41c. As a result, the positional displacement between the object to be detected 71 and the detection object 72 is less likely to occur, so that high detection accuracy can be more reliably maintained.

In addition, in the above-described embodiment, the plurality of sliding parts 45 and 47 further includes the non-holding part side sliding part 47 provided at a position avoiding the subject holding part 41c, and the holding part side sliding part is the sliding part when viewed from the axial direction. The outer shape of 45 is smaller than the outer shape of the non-holding portion side sliding portion 47 . As a result, compared with the case where the outer shape of the holding portion side sliding portion 45 is larger than the outer shape of the non-holding portion side sliding portion 47 when viewed from the axial direction, a larger installation space for the detection body 72 can be secured, so that the stroke sensor 35 can be suppressed. The size of one side of the detection body 72 is increased in the radial direction.

In addition, in the above-described embodiment, the shaft 40 is provided with the groove portion 48 recessed radially inward from the inner wall of the housing 50 . Thereby, since the contact area between the inner wall of the housing 50 and the shaft 40 can be reduced, the sliding resistance can be reduced.

Moreover, in the said embodiment, the lubricant is arrange|positioned in the groove part 48. Thereby, since the lubricant can be retained by the groove portion 48, the lubricity can be maintained.

In addition, in the above-described embodiment, a part of the outer peripheral surface of the sliding portion 47 has a shape having the flat surface 47 a, and the inner wall of the housing 50 has a shape that fits with the outer peripheral surface of the sliding portion 47 . Thereby, the movement of the shaft 40 in the circumferential direction with respect to the inner wall of the housing 50 can be restricted, so that the rotation of the shaft 40 about the axis C1 can be prevented.

In addition, in the above-described embodiment, the plurality of sliding parts 45 and 47 includes the non-holding part-side sliding part 47 (large sliding part) having a relatively large outer shape when viewed in the axial direction, and the flat surface 47a is formed on the non-holding part side Sliding portion 47 (large sliding portion). Thereby, the flat surface 47a can be enlarged. Therefore, the strength of the portion that exhibits the anti-rotation function of the shaft 40 can be ensured, and the rotation of the shaft 40 can be prevented more reliably.

Further, in the above-described embodiment, the case 50 includes the first case half body 51 and the second case half body 55 divided in the axial direction, and the plurality of sliding parts 45 and 47 are provided with the first case abutting on the first case. The holding part side sliding part 45 (first sliding part) on the inner wall of the half body 51 and the non-holding part side sliding part 47 (second sliding part) in contact with the inner wall of the second housing half body 55 , as viewed from the axial direction When viewed from the axial direction, the inner wall of the first housing half body 51 and the inner wall of the second housing half body 55 have mutually different shapes. different shapes. Therefore, even if the combination of the first housing half 51 and the shaft 40 and the combination of the second housing half 55 and the shaft 40 are wrong, the first housing half 51 and the shaft 40 cannot be assembled with each other , the second housing half body 55 and the shaft 40 cannot be assembled with each other. Therefore, erroneous assembly can be prevented.

In addition, in the above-described embodiment, high detection accuracy can be maintained in the motorcycle 1 including the above-described stroke sensor 35 .

Further, in the above-described embodiment, the description has been given by taking, as an example, that a part of the outer peripheral surface of the non-holding portion side sliding portion has a shape having a flat surface, and the inner wall of the housing has a shape that fits with the outer peripheral surface of the non-holding portion side sliding portion. , but not limited to this. For example, a portion of the outer peripheral surface of the holder-side sliding portion may have a shape having a flat surface, and the inner wall of the housing may have a shape that fits with the outer peripheral surface of the holder-side sliding portion.

In addition, in the above-described embodiment, the enlarged diameter portion 46 has been described as an example in which the enlarged diameter portion 46 does not abut (slid) on the inner wall of the casing 50 but is close to the inner wall of the casing 50 with a small gap, but the present invention is not limited thereto. For example, the enlarged diameter portion 46 may be in sliding contact with the inner wall of the housing 50 . According to this structure, in addition to the sliding parts 45 and 47, the diameter-enlarged part 46 also slides, and a sliding position increases. Thereby, the positional deviation between the to-be-detected body 71 and the detection body 72 is less likely to occur, and higher detection accuracy can be more reliably maintained.

In addition, the present invention is not limited to the above-described embodiment, and, for example, the shift gear member is not limited to a shift pedal, but may be a shift actuator (motor).

The above-mentioned saddle-ridden vehicle includes all vehicles in which the driver rides over the vehicle body. The above-mentioned ride-on vehicles include not only motorcycles (including bicycles with engines and scooter-type vehicles) but also three-wheeled vehicles (including front two-wheeled vehicles in addition to front and rear two-wheeled vehicles) and a vehicle with a rear wheel) or a vehicle with four wheels.

Furthermore, the configuration in the above-described embodiment is an example of the present invention, and various changes can be made without departing from the gist of the present invention by replacing the constituent elements of the embodiment with known constituent elements.

Claims (7)

1. a stroke sensor, is characterized in that, has: a shaft extending in a direction along the axis; A detected body, which is fixed to the above-mentioned shaft; a housing that extends along the shaft, accommodates the shaft, and supports the shaft slidably in a direction along the axis; a detection body, which detects the movement amount of the detected body that moves along with the sliding of the shaft; The above-mentioned shaft includes a plurality of shaft members which are connected to each other in the direction along the above-mentioned axis and are formed of metal, Each of the plurality of shaft members is provided with a sliding portion that abuts on the inner wall of the housing and slides so as to restrict movement of the shaft in a direction intersecting with the axis, A part of the outer peripheral surface of the sliding part has a shape with a flat surface, and the cross section of the sliding part perpendicular to the axial direction is a D-shaped shape, The inner wall of the housing has a shape that fits with the outer peripheral surface of the sliding portion, The case includes a first case half body and a second case half body divided in a direction along the axis, The plurality of sliding portions include a first sliding portion abutting against an inner wall of the first half of the housing, and a second sliding portion abutting against an inner wall of the second half of the housing, The inner wall of the first housing half body and the inner wall of the second housing half body have mutually different shapes when viewed from the direction along the above-mentioned axis, The first sliding portion and the second sliding portion have mutually different shapes when viewed in the direction along the axis. 2. The stroke sensor according to claim 1, characterized in that, The shaft includes a subject holding portion that accommodates and holds the subject, and The plurality of sliding portions include a holding portion side sliding portion provided in the object holding portion. 3. The stroke sensor according to claim 2, characterized in that, The plurality of sliding parts further includes a non-holding part side sliding part provided at a position avoiding the object holding part, The outer shape of the sliding portion on the holding portion side is smaller than the outer shape of the sliding portion on the non-holding portion side when viewed in the direction along the axis. 4. The stroke sensor according to any one of claims 1 to 3, characterized in that, The shaft is provided with a groove portion recessed radially inward from the inner wall of the housing. 5. The stroke sensor according to claim 4, characterized in that, A lubricant is arranged in the groove portion. 6. The stroke sensor of claim 1, wherein The plurality of sliding portions include large sliding portions having a relatively large outer shape when viewed in a direction along the axis, The flat surface is formed on the large sliding portion. 7 . A straddle-type vehicle comprising the stroke sensor according to claim 1 . 8 .

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